<!DOCTYPE html>
<html lang='en'>
<head>
    <meta charset='UTF-8'>
    <title></title>
    <style>
        .div1{
            width: 100px;
            height: 100px;
            background: red;
        }
        .div2{
            width: 200px;
            height: 200px;
            background:yellow;
        }
    </style>
</head>
<body>
<div class = "div1" >
    1
</div>
<div class = "div2">
    2
</div>
</body>
</html>